Accession Number:

ADA076508

Title:

Comparison of Measured Data with IF-77 Propagation Model Predictions

Descriptive Note:

Final rept.

Corporate Author:

NATIONAL TELECOMMUNICATIONS AND INFORMATION ADMINISTRATION BOULDER CO INST FOR TELECOMMUNICATION SCIENCES

Personal Author(s):

• Johnson, M. E.
• Gierhart, G. D.

Report Date:

1979-08-01

Pagination or Media Count:

443.0

Abstract:

This report provides extensive comparisons of measured propagation data with predictions made by the IF-77 ITS-FAA-77 and other propagation models. Although IF-77 was developed for aeronautical applications, it can be used for some point-to-point propagation paths, and the measured data selected for comparison includes point-to-point as well as aeronautical paths. Approximately 870,000 hours of data are associated with the 242 paths used. Predictions made with IF-77 were always best or second best were substantially better than those made for free space conditions. The IF-77 model has a wide range of application and provides predictions compatible with the more specialized models tested. A discussion of the aeronautical propagation data pool from which the data were selected is included as an appendix. Author

Descriptors:

• *PROPAGATION
• *AERONAUTICS
• COMPUTER PROGRAMS
• DATA PROCESSING
• PREDICTIONS
• MODELS
• COMPARISON
• NAVIGATIONAL AIDS

Subject Categories:

• Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE